Baker&#39;s oven.



I PATENTBD OCT. 20, 1903.

G. S. BAKER.

BAKERS OVEN.

APPLICATION FILED An. 14, 1903.

6 SHEETS-SHEET 1.

N0 MODEL.

4.1mm wnsumemn a c PATENTED OCT. 20, 1903;.

G. S. BAKER.

BAKERS OVEN. APPLICATION IiLED APR? 14, 19b3.'

6 SHEETS-SHEET 2.

N0 MODEL.

(DQ996200 09G Wz may 1,) w flzzarm TO-LITHQ, WASHINGTON u a PATENTEDOCT. 20, 1903.

' G.S.BAKER. BAKERS OVEN.

APPLICATION FILED APR. 14, 1903.

' 6 SHEETS- SHEET 3- W/BW/ PA'TENTEDOOT. 20,1903.

G- S. BAKER. BAK ERS OVEN. APPLICATION FILED APR. 14, 1903.

N0 MODEL.

6 SHEETS-SHEET 4- PATENTED OCT. 20, 1903.

G. S. BAKER.

vBAKERS OVEN. 4

APPLICATION FILED APR.14, 1903.

6 SHEETS-SHEET 6- N0 MODEL.

No. 741,757. v PATENTED OCT. 20, 1903. G. S. BAKER.

BAKERS OVEN.

A'PPLIUATION rum) APR.14. 1903.

6 SHEETS-SHEET 6.

N0 MODEL.

Wz'Zizera'es Fig. 12.

UNITED STATES Patented October 20, 1903.

PATENT OFFICE.

BAKERS OVEN.

SPECIFICATION forming part of Letters Patent No. 741,757, dated October20, 1903.

Application filed April 14, 1903. Serial No. 152,594. (No model.)

To all whom it may concern.-

Be it known that LGEORGE SAMUEL BAKER, a subject of the.King of England,residing at Willesden Junction, county of Middlesex, England, haveinvented certain new and useful Improvements in Bakers Ovens, of whichthe following is a specification.

This invention relates to bakers ovens in which provision is made forthe heating of the oven or of the goods therein by means of steam-pipesand flash heat; and it consists in the improved construction of suchoven, whereby the gases from the furnace after they have passed into andfrom the interior of the oven may be regulated to pass in the desiredproportion to the chimney and to the furnace or to either the chimney orthe furnace, as may be desired at the time of use. Such gases afterleaving the interior of the oven may also be used forimparting heattoincoming air for the furnace, whether said gases or a portion of thembe mixed with said incoming air or not.

Three examples of the improved oven constructed according to thisinvention are illustrated in the annexed drawings.

Figure l is a longitudinal vertical section of an oven on line 1 1 ofFig. 2. Fig. 2 is a horizontalsection on line 2 2, Fig. 1. Fig. 3 is avertical cross-section on line 3 3, Fig. 2. Fig. 4 is a part sideelevation showing in dotted lines the position of certain flues. Fig. 5is a detail sectional view of said flues. Fig. 6 is a longitudinalvertical section on line 6 6, Fig. 7, of amodified oven. Fig. 7 is ahorizontal section thereof on line 7 7, Fig. 6. Fig. 8 is a verticalcross-section on line 8 8, Fig. 7. Fig. 9 is a part side elevationshowing in dotted lines the position of certain flues in this oven. Fig.10 is a detail sectional view of said flues. Fig. 11 is a longitudinalvertical section on line 11 11, Fig. 12, of a further modified oven.Fig. 12 is a horizontal section on line 12 12 of Fig. 11. Fig. 13 is avertical cross-section on line 13 13,

Fig. 14 is a part side elevation showing in dotted lines the position ofcertain fiues in the oven. Fig. 15 is a detail sectional view of saidflues.

The oven illustrated in Figs. 1 to 5 has the heating-furnace at thefront end. The sole of the oven is heated by Perkins tubes P,

one end is continued into the side wall of the oven and ascendsvertically or otherwise therein and opens into the interior space of theoven at C at any desired place, butpreferably near the top of the oven.At some other desired place on the wall of theinterior of the oven,butpreferably at alow level and preferably comparatively near thefurnace, there is an outlet D for the furnace-gases that have passedthrough the interior of the oven. This outlet D is controlled by adamper D, which may be arranged to rise and fall in a vertical plane.TheoutletDleadsintoachamber E in the oven-wall, which is traversed bypipes I or other form of heat interchanger forming part of thecold-air-inlet flue. From said chamber E there are three outlets, eachcontrolled by a damper-namely, one outlet, F, leading to the chimney,one outlet, G, leading tojthe furnace and entering, preferably, at theback wall of the combustion-space, as shown at G in Fig. 3, and thethird outlet, H, leading into the air-inlet fiue. The airinlet flue J,having a controlling-damper J, passes from a suitable place of theexterior of the oven to the heat-interchanger I and thence to thefurnace, which it enters laterally beneath the grate at J The ovenillustrated in Figs. 6 to 10 has its heating-furnace at the rear end andis shown as provided with two furnace-grates. The flue B is of the samewidth and height as the interior space of the oven and has its outlet 0into the interior of the oven at the middle of the rear end of the oven.The outlet D for gases from the oven and the chamber E, with its outletsF G H, dampers thereto, and heat-interchanger Lare the same as abovedescribed with reference to the oven illus trated in Figs. 1 to 5,except that they are placed near to the rear wall of the oven in Figs. 6to 10 to correspond with the location of the furnace. The air-flue J isin this case shown as passing across from the opposite side of the oventhrough the thickness of the rear wall of the interior of the oven-After passing the heat interchanger it leads to openings J J beneath thelevel of and behind the respective grates. The opening G of the flue Gis situated laterally of one of the grates above the grate-level.

Figs. 11 to 15 illustrate a gas-fired oven with the furnace at the rearend; but this furnace may also be placed at any other convenientposition. The atmospheric burnerpipe K extends across beneath the endsof the Perkins tubes and is supplied by gas from nozzle K and air from ablower K or by producer or other gas according to the manner usuallyemployed for burning any such gas. The air-flue is shown as having threeports J J' J, in front of which are inspection-openings closed by doors.The flue G and its damper G are omitted.

The arrangement of flues in these three ovens, as above described,enables the furnace-gases to be used not only first for heating thePerkins tubes, but afterward for flash heat in the interior of the oven.After they have passed through the oven they may pass wholly to thechimney or part of them may be passed to the chimney and the remaindermay be again passed through the furnace in intermixture with theincoming air. The flue G may be used occasionally when the fires aredamped down, the damper regulating the waste heat to the chimney beingclosed. The gases then circulate over and again through the furnace andoven. The flue G can also, if required, be employed for directcommunication from the furnace to the chimney.

In the example in Figs. 11 to 15 part of the flue J can be used in.place of the flue G, the dampers F and J being closed and damper-Hopened.

I do not-claim, broadly, the use of the furnace-gases for flash heat inthe interior of the oven after they have been used for heating Perkinstubes; but

I claim- 1. A bakers oven intended to be heated by use of Perkins tubesand by flash heat, having flues comprising a flue for heating thePerkins tubes and leading thereafter directly into the interior of theoven, a dampercontrolled flue from the interior ofthe oven to a chamberwhence a damper-controlled controlled flue from the interior of the ovento a chamber whence a damper-controlled flue leads to the chimney, andanother damper-controlled flue for the return of furnacegases leads tothe furnace, a heat -interchanger located in said chamber, and form-.ing apart of an air-flue to the furnace substantially as and for thepurpose set forth.

8. A bakers oven intended to be heated by use of Perkins tubes and byflash heat, having flues comprising a flue for heating the Perkins tubesand leading thereafter directly into the interior of the oven, adampercontrolled flue from the interior of the oven to a chamber whencea damper-controlled flue leads to the chimney and anotherdamper-controlled flue for return of furnacegases leads to the furnace aheat interchanger located in said chamber and forming a part of anair-flue to the furnace, and a damper-controlled flue leading from saidchamber into said air-flue substantially as and for the purpose setforth.

4. A bakers oven intended to be heated by use of Perkins tubes and byflash heat, having flues comprising a flue for heating the Perkins tubesand leading thereafter directly into the interior of the oven, adampercontrolled flue from the interior of the oven to a chamber whencea damper-controlled flue leads to the chimney, a heat interchangerlocated in said chamber and forming a part of an air-flue to the furnaceand a dampercontrolled flue leading from said chamber intosaid air-fluesubstantially as and for the purpose set forth.

In witness whereof I have signed this specification in the presence oftwo witnesses.

. GEORGE SAMUEL BAKER.

Witnesses:

WALTER J SKERTEN, W. J. NORWOOD.

